import java.util.Scanner;
public class Example5 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int num = sc.nextInt();
		sc.close();
		boolean isPrimeNum = true;
		for(int i =2; i< num; i++) {
			if (num%i==0) {
				isPrimeNum = false;
				break;
			}
		}
		if(isPrimeNum) {
			System.out.println(num+"是素数");
		}else {
			
			System.out.println(num+"是偶数");
		}
		/*
		 int i;
		 for(i=2;i<num; i++){
		 	if(num%i==0)
		 	break;
		  }
		  
		  if(i == num){
		  	System.out.println(num+"是素数");
		  }else{
		  	System.out.println(num+"是偶数");
		  
		  }
		 * 
		 * */
				
	}
}
